A friend recently commented that he has divorced himself from the political left; another friend waggishly suggested that he is still married to it but could use some relationship counseling.
Speaking for myself, I wouldn't quite claim that I'm happily married to the left, but I am committed to the marriage.
Truth to tell, I've been stepping out on the left a bit, in online forums, for some time. It's fun, and some of those other political philosophies are sexy and fun. But while the left can be annoying at times, it isn't batshit crazy like so many of those “alternative” political philosophies you meet on the internet.
So a little flirting with other philosophies has only strengthened my marriage to progressivism. It may not quite be like when I was young, but when you get older you develop more realistic expectations.